Re: [w3c/webcomponents] [idea] Allow HTML Element attributes to accept any type of value, not just strings. (#519)

You can keep then with the same name.
```JavaScript
class MyElement extends HTMLElement
{
    // ...
    attributeChangedCallback(name, o, n)
    {
        if(name === "data-my-attribute")
        {
            this["data-my-attribute"] = JSON.parse(n);
        }
    }
}
```
Or convert then from dash-case to camel-case and vice-versa.

But honestly, I think libraries/frameworks should interact directly with the property instead of with the attribute, having the `attributeChangedCallback` only be used to allow authors to provide a value to the property from HTML.

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